CN110551433A - Water-based metal coating and preparation method thereof - Google Patents
Water-based metal coating and preparation method thereof Download PDFInfo
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- CN110551433A CN110551433A CN201910881421.2A CN201910881421A CN110551433A CN 110551433 A CN110551433 A CN 110551433A CN 201910881421 A CN201910881421 A CN 201910881421A CN 110551433 A CN110551433 A CN 110551433A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
- C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09D133/062—Copolymers with monomers not covered by C09D133/06
- C09D133/066—Copolymers with monomers not covered by C09D133/06 containing -OH groups
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0881—Titanium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The invention discloses a water-based metal coating and a preparation method thereof, wherein the water-based metal coating comprises the following components: 30-50 parts of water-based acrylic resin, 20-70 parts of nano titanium silicon carbide modified acrylic resin, 15-25 parts of pigment, 0.5-1.0 part of rheological additive, 0.1-0.2 part of pH regulator, 0.5-0.8 part of defoaming agent, 3-4 parts of film-forming additive, 0.2-0.8 part of flash rust inhibitor, 5-10 parts of cosolvent, 2-4 parts of wetting dispersant, 0.5-1 part of base material wetting agent, 1-2 parts of thickening agent and 5-10 parts of deionized water. The water-based metal coating provided by the invention has the advantages of strong adhesive force, high drying speed and excellent corrosion resistance, can achieve the same effect as the metal surface subjected to sand blasting treatment or corrosion roughening treatment without carrying out sand blasting treatment or corrosion roughening treatment on the metal surface, greatly simplifies the construction difficulty and has wide market prospect.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a water-based metal coating and a preparation method thereof.
Background
In order to enhance the weather and corrosion resistance, prolong the service life and enhance the aesthetic appearance of metals, surface treatment of metal materials is often required. There are many kinds of metal surface treatment technologies, and the current metal surface treatment technologies mainly include electroplating, chemical plating, coating technologies, and the like. The method of protecting metal surface by coating technology is long-standing, and the most simple and effective method is to coat the metal surface with paint with certain performance and form a layer of compact protecting film on the metal surface after the solvent in the paint is evaporated. In recent years, with the rapid development of social economy, the demand for metallic coatings has increased, and the requirements for the performance of metallic coatings have become higher and higher. In recent years, many water-based metal coatings have appeared on the market, and have been widely used due to their advantages of low cost, environmental protection, surface decoration effect and good workability.
at present, the problems that the drying speed of the water-based metal coating in the market is low, the corrosion resistance has a certain gap compared with the solvent-based coating, and the like generally exist. The water-based industrial coating with high drying speed and good corrosion resistance is a great direction of market demand. The acrylic resin coating has the advantages of short drying time, good flexibility and good weather resistance, but has poor adhesive force, particularly poor adhesive force to a metal substrate, so that the corrosion resistance of the acrylic resin coating is poor. Therefore, the development of a metal coating with excellent performance, quick drying, good adhesion and excellent corrosion resistance is a trend of the development industry of water-based metal coatings.
Disclosure of Invention
aiming at the problems that the existing water-based metal coating in the prior art cannot realize quick drying, good adhesive force and good corrosion resistance, the invention provides the water-based metal coating and the preparation method thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the water-based metal coating comprises the following raw material components in parts by mass: 30-50 parts of water-based acrylic resin, 20-70 parts of nano titanium silicon carbide modified acrylic resin, 15-25 parts of pigment, 0.5-1.0 part of rheological additive, 0.1-0.2 part of pH regulator, 0.5-0.8 part of defoaming agent, 3-4 parts of film-forming additive, 0.2-0.8 part of flash rust inhibitor, 5-10 parts of cosolvent, 2-4 parts of wetting dispersant, 0.5-1 part of base material wetting agent, 1-2 parts of thickening agent and 15-20 parts of deionized water.
Compared with the prior art, the metal coating provided by the invention selects the water-based acrylic resin and the nano titanium silicon carbide modified acrylic resin to be compounded as the film forming substance, so that the coating meets the quick-drying requirement and also obviously improves the adhesive force of the coating to a metal substrate; by matching with other additives, the coating provided by the invention has multiple advantages of high drying speed, good adhesive force, high hardness, excellent corrosion resistance and the like. The waterborne metal coating provided by the invention has extremely low VOC content, can reduce the pollution to the environment and the damage to the human body to the greatest extent, and has wide application prospect and development potential.
Preferably, the nano titanium silicon carbide modified acrylic resin comprises the following raw material components in parts by mass: 15-20 parts of hydroxyethyl methacrylate, 15-20 parts of methyl methacrylate, 10-15 parts of butyl acrylate, 0.5-1 part of methacrylic acid, 5-8 parts of styrene, 1-1.5 parts of silane coupling agent, 0.2-0.4 part of initiator, 4-6 parts of nano titanium silicon carbide, 0.3-0.5 part of surfactant, 1-1.5 parts of emulsifier, 0.2-0.4 part of pH regulator and 30-40 parts of deionized water.
the silane coupling agent may be a silane coupling agent conventional in the art, such as KH-550, KH-560, etc.; the above initiator may be an initiator conventional in the art, such as cumene hydroperoxide, di-t-butyl peroxide, ammonium persulfate, t-butyl peroxybenzoate, benzoyl peroxide, etc.; the surfactant may be a surfactant conventional in the art, such as sodium dodecyl sulfate, etc.; the above emulsifier may be an emulsifier conventional in the art, such as OP-10, etc.; the pH regulator is conventional in the art, such as sodium hydroxide, potassium hydroxide, sodium bicarbonate, ammonia, dimethylethanolamine, triethylamine, etc.
Preferably, the particle size of the nano-titanium silicon carbide is 50-100 nm.
Preferably, the preparation method of the nano titanium silicon carbide modified acrylic resin comprises the following steps:
step a, weighing all components according to a designed ratio, and uniformly mixing weighed hydroxyethyl methacrylate, methyl methacrylate, butyl acrylate, methacrylic acid, styrene, a silane coupling agent and nano titanium silicon carbide to obtain a mixed dispersion liquid;
Step b, adding an emulsifier, a surfactant and a pH regulator into 70-80 wt% of deionized water to obtain a composite emulsifier;
Step c, dissolving the weighed initiator into the rest deionized water to obtain an initiator solution;
D, mixing 40-60 wt% of the composite emulsifier with 20-40 wt% of the mixed dispersion liquid, heating to 50-60 ℃, adding 40-60 wt% of the initiator solution, and reacting for 2-3h at 75-85 ℃ to obtain a first emulsion;
and e, adding the rest of the mixed dispersion liquid, the rest of the composite emulsifier and the rest of the initiator solution into the first emulsion, and reacting for 1-2h at the temperature of 90-95 ℃ to obtain the nano titanium silicon carbide modified acrylic resin.
Silicon titanium carbide is a comprehensive ceramic material, and not only has the advantages of high temperature resistance, oxidation resistance and high strength, but also has the advantages of electric conductivity, heat conductivity, machinability and plasticity of metal materials. However, the nano titanium silicon carbide is an inorganic particle, and when the nano titanium silicon carbide is introduced into a coating system, a conglomerate structure is easy to form, so that the performance of the coating is not improved, and certain performances (such as the uniformity and the elasticity of a paint film and the like) of the coating are reduced. By adopting the modification method provided by the invention, the C in the nano titanium silicon carbide is ingeniously utilized to be chemically bonded with the hydroxyl, double bond and the like in acrylic acid, so that the inorganic nano titanium silicon carbide is grafted in the structure of the organic acrylic resin, the performance of the acrylic resin is obviously improved, the compatibility between the inorganic nano titanium silicon carbide and other components in the paint is also obviously enhanced, and the uniformity and compactness of a paint film are further improved. And Ti in the nano titanium silicon carbide can enhance the wettability of acrylic resin to a metal substrate, and Si can also generate a bonding effect with a metal substrate, so that a paint film is firmly attached to the surface of the substrate.
Preferably, the glass transition temperature of the aqueous acrylic emulsion is 60-64 ℃, the acid value is 40-44mgKOH/g, and the solid content is 44-46%
More preferably, the aqueous acrylic emulsion is Disemann's A639.
the preferred aqueous acrylic emulsions have the advantage of high gloss, high transparency, excellent water resistance and alcohol resistance. The preferable acrylic resin is compounded with the nano titanium silicon carbide modified acrylic resin, so that the paint film of the paint has the characteristics of quick drying, strong adhesive force, excellent corrosion resistance and the like, and the adhesive force of the paint on the surface of metal, particularly aluminum substrate, is greatly improved.
preferably, the rheological additive is an associated polyurethane leveling agent which does not contain a solvent and alkylphenol ethoxylates.
More preferably, the rheology aid is COAPUR 2025, which is a Gaotai.
the preferable rheological additive has extremely strong association capacity with acrylic resin and nano titanium silicon carbide modified acrylic resin, and can improve the bonding strength of a paint film to a metal substrate, thereby obviously enhancing the compactness of the paint film and improving the adhesive force of the paint film and the substrate.
Preferably, the pH regulator is N, N-dimethylethanolamine.
The preferable pH regulator not only has the effect of regulating the pH, but also is an organic substance and has certain auxiliary film forming characteristics.
preferably, the defoamer is a molecular scale defoamer.
More preferably, the defoamer is FoamStar a 10.
The preferable defoaming agent has a lasting defoaming and foam inhibiting effect, has no side effect on the appearance and uniformity of the paint film, and does not cause the phenomenon that fish eyes, craters and the like influence the appearance of the paint film. The foam generated in the process of adding the curing agent can be prevented when the curing agent is applied to the system.
Preferably, the film-forming assistant is a mixture of tripropylene glycol methyl ether and dipropylene glycol butyl ether in a mass ratio of 1-3: 1.
the high-boiling point tripropylene glycol methyl ether and dipropylene glycol butyl ether are selected and compounded in a specific proportion, so that the lowest film forming temperature of a paint film can be effectively reduced, the film forming performance of the paint film is improved, and the drying speed, the strength and the weather resistance of the paint film are improved.
Preferably, the cosolvent is one or two of ethylene glycol butyl ether or propylene glycol methyl ether.
the preferable cosolvent is matched with the film-forming assistant, so that the coating has a proper surface drying speed, and the phenomenon that the paint film is too quickly shrunk due to too high drying speed, so that the paint film cannot be fully combined with a metal substrate, and the adhesion strength of the paint film and the substrate is low is avoided. Preferred coalescents optimize the coating for fast drying and adhesion, and provide a balance.
Preferably, the wetting and dispersing agent is a high molecular weight block copolymer solution with pigment affinity groups.
More preferably, the wetting and dispersing agent is Tego-760W, Digao.
The preferred wetting dispersant can enhance the compatibility among the components in the coating, uniformly disperse the components in the coating in a system and is beneficial to ensuring that the coating is uniformly and firmly attached to a metal substrate, and the preferred wetting dispersant can also cause the pigment to be deflocculated through steric hindrance, and the deflocculated pigment particles are few, thereby enhancing the glossiness and the strength of a paint film.
Preferably, the substrate wetting agent is a polyether modified polysiloxane wetting agent.
More preferably, the substrate wetting agent is BYK-331 from Bick, Germany.
The polyether modified polysiloxane has the advantages of ethers and organic silicon substances, has excellent substrate wettability, excellent flow promotion property and high compatibility, has the capability of improving scratch resistance, can prevent shrinkage cavity and pigment flooding, does not generate foam stabilization, does not increase surface smoothness, and does not damage the recoatability of the coating. The preferable substrate wetting agent, the rheological additive and the wetting dispersant act synergistically, so that all components in the coating are uniformly dispersed in a coating system, the binding force of the coating to a metal substrate and the compactness of a paint film are enhanced, and the corrosion resistance of the coating is further enhanced.
Preferably, the thickener is an alkali swelling associative thickener.
More preferably, the thickener is RW-8M from Rohm and Haas.
the alkali swelling association type thickener has certain surfactant performance, a reticular cross-linked structure formed by macromolecules of the thickener is separated at a high shearing rate to reduce the viscosity, the cross-linked structure is formed again after shearing is removed to recover the viscosity, but the re-association takes time, so the recovery of the viscosity is not as fast as that of cellulose, the leveling is facilitated, the gloss is improved, and meanwhile, under the general condition, the thickener is condensed together and expands when meeting alkali, and the thickener is cooperatively matched with the rheological additive in the invention, so the leveling property of the paint is greatly improved, and the constructability of the paint is facilitated.
The invention also provides a preparation method of the water-based metal coating, which at least comprises the following steps:
Step a, weighing the components according to the design proportion of the metal coating, uniformly stirring the weighed water-based acrylic resin, cosolvent, wetting dispersant, defoamer and pigment, and grinding until the fineness is less than or equal to 25 mu m to obtain mixed slurry;
And b, adding the weighed nano titanium silicon carbide modified acrylic resin, film forming auxiliary agent, anti-flash rust agent, substrate wetting agent, rheological auxiliary agent and deionized water into the mixed slurry, stirring and mixing uniformly, adding thickening agent, and adjusting the stormer viscosity to 25 ℃ to 85-95KU to obtain the water-based metal coating.
The preparation method is simple to operate, free of complex procedures, free of special equipment, low in cost and suitable for industrial large-scale production, the prepared water-based metal coating has the advantages of being strong in adhesive force, high in drying speed and excellent in corrosion resistance, the same effect as that of the metal surface subjected to sand blasting or corrosion roughening can be achieved without carrying out sand blasting or corrosion roughening on the metal surface, construction difficulty is greatly simplified, and the water-based metal coating has a wide market prospect.
Detailed Description
in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
example 1
the embodiment of the invention provides a water-based metal coating which comprises the following raw material components in parts by weight: 30 parts of water-based acrylic resin, 70 parts of nano titanium silicon carbide modified acrylic resin, 20 parts of pigment, 0.8 part of rheological additive, 0.1 part of pH regulator, 0.8 part of defoaming agent, 3 parts of film-forming additive, 0.8 part of anti-flash rust agent, 8 parts of cosolvent, 2 parts of wetting dispersant, 0.5 part of base material wetting agent, 1 part of thickening agent and 20 parts of deionized water.
Wherein the water-based acrylic emulsion is Disemann A639; the rheological additive is 2025 of Gaotai; the pigment is rutile type titanium dioxide R-996; the pH regulator is N, N-dimethylethanolamine; the antifoaming agent is FoamStarA 10; the film-forming assistant is a mixture of tripropylene glycol methyl ether and dipropylene glycol butyl ether in a mass ratio of 2: 1; the flash rust inhibitor is a Halox515 flash rust inhibitor in the United states; the cosolvent is propylene glycol methyl ether; the wetting dispersant is Tego-760W with digao; the substrate wetting agent is BYK-331 of Bike Germany; the thickener was RW-8M from Rohm and Haas.
The nano titanium silicon carbide modified acrylic resin comprises the following raw material components in parts by mass: 15 parts of hydroxyethyl methacrylate, 20 parts of methyl methacrylate, 13 parts of butyl acrylate, 0.8 part of methacrylic acid, 7 parts of styrene, KH-5601 parts, 0.4 part of benzoyl peroxide, 4 parts of nano titanium silicon carbide, 0.5 part of sodium dodecyl sulfate, OP-101 parts, 0.2 part of potassium hydroxide and 40 parts of deionized water.
the preparation method of the nano titanium silicon carbide modified acrylic resin comprises the following steps:
step a, weighing all components according to a designed ratio, and uniformly mixing weighed hydroxyethyl methacrylate, methyl methacrylate, butyl acrylate, methacrylic acid, styrene, KH-560 and nano titanium silicon carbide to obtain a mixed dispersion liquid;
Step b, adding OP-10, sodium dodecyl sulfate and potassium hydroxide into 75 wt% of deionized water to obtain a composite emulsifier;
C, dissolving the weighed benzoyl peroxide into the rest deionized water to obtain an initiator solution;
D, mixing 50 wt% of the composite emulsifier with 30 wt% of the mixed dispersion liquid, heating to 50 ℃, adding 40 wt% of the initiator solution, and reacting for 2.5 hours at 80 ℃ to obtain a first emulsion;
And e, adding the rest of the mixed dispersion liquid, the rest of the composite emulsifier and the rest of the initiator solution into the first emulsion, and reacting for 1.5 hours at the temperature of 92 ℃ to obtain the nano titanium silicon carbide modified acrylic resin.
The preparation steps of the water-based metal coating are as follows:
step a, weighing all components according to the design proportion of the water-based metal coating, uniformly stirring the weighed water-based acrylic resin, cosolvent, wetting dispersant, defoamer and pigment, and grinding until the fineness is less than or equal to 25 mu m to obtain mixed slurry;
And b, adding the weighed nano titanium silicon carbide modified acrylic resin, film forming auxiliary agent, anti-flash rust agent, substrate wetting agent, rheological auxiliary agent and deionized water into the mixed slurry, stirring and mixing uniformly, adding thickening agent, and adjusting the stormer viscosity to 25 ℃ to 85-95KU to obtain the water-based metal coating.
Example 2
The embodiment of the invention provides a water-based metal coating which comprises the following raw material components in parts by weight: 40 parts of water-based acrylic resin, 45 parts of nano titanium silicon carbide modified acrylic resin, 25 parts of pigment, 1.0 part of rheological additive, 0.2 part of pH regulator, 0.5 part of defoaming agent, 3.5 parts of film-forming additive, 0.2 part of anti-flash rust agent, 10 parts of cosolvent, 3 parts of wetting dispersant, 1 part of base material wetting agent, 2 parts of thickening agent and 18 parts of deionized water.
the above-mentioned components are given the same designations as in example 1, except that: the film-forming assistant is a mixture of tripropylene glycol methyl ether and dipropylene glycol butyl ether in a mass ratio of 1: 1; the cosolvent is a mixture of ethylene glycol butyl ether and propylene glycol methyl ether in a mass ratio of 1: 1.
The nano titanium silicon carbide modified acrylic resin comprises the following raw material components in parts by mass: 18 parts of hydroxyethyl methacrylate, 15 parts of methyl methacrylate, 10 parts of butyl acrylate, 1 part of methacrylic acid, 5 parts of styrene, KH-5601.5 parts, 0.3 part of ammonium persulfate, 6 parts of nano-titanium silicon carbide, 0.3 part of sodium dodecyl sulfate, OP-101.2 parts, 0.3 part of sodium bicarbonate and 35 parts of deionized water.
The preparation method of the nano titanium silicon carbide modified acrylic resin comprises the following steps:
Step a, weighing all components according to a designed ratio, and uniformly mixing weighed hydroxyethyl methacrylate, methyl methacrylate, butyl acrylate, methacrylic acid, styrene, KH-560 and nano titanium silicon carbide to obtain a mixed dispersion liquid;
step b, adding OP-10, sodium dodecyl sulfate and sodium bicarbonate into 70 wt% of deionized water to obtain a composite emulsifier;
step c, dissolving the weighed ammonium persulfate into the rest deionized water to obtain an initiator solution;
step d, mixing 60 wt% of the composite emulsifier with 40 wt% of the mixed dispersion liquid, heating to 55 ℃, adding 50 wt% of the initiator solution, and reacting for 2 hours at 85 ℃ to obtain a first emulsion;
And e, adding the rest of the mixed dispersion liquid, the rest of the composite emulsifier and the rest of the initiator solution into the first emulsion, and reacting for 2 hours at the temperature of 90 ℃ to obtain the nano titanium silicon carbide modified acrylic resin.
The preparation method of the water-based metal coating is the same as that of the example 1, and the details are not repeated.
Example 3
The embodiment of the invention provides a water-based metal coating which comprises the following raw material components in parts by weight: 50 parts of water-based acrylic resin, 20 parts of nano titanium silicon carbide modified acrylic resin, 15 parts of pigment, 0.5 part of rheological additive, 0.15 part of pH regulator, 0.6 part of defoaming agent, 4 parts of film-forming additive, 0.6 part of anti-flash rust agent, 5 parts of cosolvent, 4 parts of wetting dispersant, 0.8 part of base material wetting agent, 1.5 parts of thickening agent and 15 parts of deionized water.
the above-mentioned components are given the same designations as in example 1, except that: the film-forming assistant is a mixture of tripropylene glycol methyl ether and dipropylene glycol butyl ether in a mass ratio of 3: 1; the cosolvent is ethylene glycol butyl ether.
The nano titanium silicon carbide modified acrylic resin comprises the following raw material components in parts by mass: 20 parts of hydroxyethyl methacrylate, 18 parts of methyl methacrylate, 15 parts of butyl acrylate, 0.5 part of methacrylic acid, 8 parts of styrene, KH-5501.2 parts, 0.2 part of ammonium persulfate, 5 parts of nano titanium silicon carbide, 0.4 part of sodium dodecyl sulfate, OP-101.5 parts, 0.4 part of triethylamine and 30 parts of deionized water.
the preparation method of the nano titanium silicon carbide modified acrylic resin comprises the following steps:
step a, weighing all components according to a designed ratio, and uniformly mixing weighed hydroxyethyl methacrylate, methyl methacrylate, butyl acrylate, methacrylic acid, styrene, KH-550 and nano titanium silicon carbide to obtain a mixed dispersion liquid;
Step b, adding OP-10, sodium dodecyl sulfate and triethylamine into 80 wt% of deionized water to obtain a composite emulsifier;
step c, dissolving the weighed ammonium persulfate into the rest deionized water to obtain an initiator solution;
D, mixing 40 wt% of the composite emulsifier with 20 wt% of the mixed dispersion liquid, heating to 60 ℃, adding 60 wt% of the initiator solution, and reacting for 3 hours at 75 ℃ to obtain a first emulsion;
and e, adding the rest of the mixed dispersion liquid, the rest of the composite emulsifier and the rest of the initiator solution into the first emulsion, and reacting for 1h at the temperature of 95 ℃ to obtain the nano titanium silicon carbide modified acrylic resin.
The preparation method of the water-based metal coating is the same as that of the example 1, and the details are not repeated.
Comparative example 1
The comparative example of the present invention provides an aqueous metallic paint, and the formulation and preparation method of the paint are the same as those of example 1. Except that the nano titanium silicon carbide modified acrylic resin in example 1 was replaced with the nano titanium nitride modified acrylic resin. The raw material components and the preparation method of the nano titanium nitride modified acrylic resin are the same as those of the nano titanium silicon carbide modified acrylic resin, and the difference is that the nano titanium silicon carbide is replaced by nano titanium nitride.
in order to better embody the properties of the aqueous metallic paints prepared in the examples of the present invention, the aqueous metallic paints prepared in the above examples 1 to 3 and comparative example 1 were directly sprayed on the surface of the aluminum substrate which had been subjected to only the desmear treatment without the sand blasting or the corrosion roughening treatment, and the performance tests were carried out, and the results are shown in Table 1.
TABLE 1
Note: the bond strength was measured by Elcometer.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The water-based metal coating is characterized by comprising the following raw material components in parts by mass: 30-50 parts of water-based acrylic resin, 20-70 parts of nano titanium silicon carbide modified acrylic resin, 15-25 parts of pigment, 0.5-1.0 part of rheological additive, 0.1-0.2 part of pH regulator, 0.5-0.8 part of defoaming agent, 3-4 parts of film-forming additive, 0.2-0.8 part of flash rust inhibitor, 5-10 parts of cosolvent, 2-4 parts of wetting dispersant, 0.5-1 part of base material wetting agent, 1-2 parts of thickening agent and 5-10 parts of deionized water.
2. The water-based metal paint as claimed in claim 1, wherein the nano titanium silicon carbide modified acrylic resin comprises the following raw materials in parts by mass: 15-20 parts of hydroxyethyl methacrylate, 15-20 parts of methyl methacrylate, 10-15 parts of butyl acrylate, 0.5-1 part of methacrylic acid, 5-8 parts of styrene, 1-1.5 parts of silane coupling agent, 0.2-0.4 part of initiator, 4-6 parts of nano titanium silicon carbide, 0.3-0.5 part of surfactant, 1-1.5 parts of emulsifier, 0.2-0.4 part of pH regulator and 30-40 parts of deionized water.
3. The aqueous metallic paint according to claim 2, wherein the preparation method of the nano titanium silicon carbide modified acrylic resin comprises the following steps:
Step a, weighing all components according to a designed ratio, and uniformly mixing weighed hydroxyethyl methacrylate, methyl methacrylate, butyl acrylate, methacrylic acid, styrene, a silane coupling agent and nano titanium silicon carbide to obtain a mixed dispersion liquid;
Step b, adding an emulsifier, a surfactant and a pH regulator into 70-80 wt% of deionized water to obtain a composite emulsifier;
step c, dissolving the weighed initiator into the rest deionized water to obtain an initiator solution;
D, mixing 40-60 wt% of the composite emulsifier with 20-40 wt% of the mixed dispersion liquid, heating to 50-60 ℃, adding 40-60 wt% of the initiator solution, and reacting for 2-3h at 75-85 ℃ to obtain a first emulsion;
and e, adding the rest of the mixed dispersion liquid, the rest of the composite emulsifier and the rest of the initiator solution into the first emulsion, and reacting for 1-2h at the temperature of 90-95 ℃ to obtain the nano titanium silicon carbide modified acrylic resin.
4. The aqueous metallic coating according to claim 1, wherein the aqueous acrylic emulsion has a glass transition temperature of 60 to 64 ℃, an acid value of 40 to 44mgKOH/g, and a solid content of 44 to 46%.
5. The aqueous metallic coating of claim 1, wherein the rheological aid is an associative polyurethane leveling agent free of solvents and alkylphenol ethoxylates.
6. The aqueous metallic coating of claim 1, wherein the pH adjuster is N, N-dimethylethanolamine; and/or
The defoaming agent is a molecular defoaming agent.
7. The aqueous metallic coating according to claim 1, wherein the film-forming aid is a mixture of tripropylene glycol methyl ether and dipropylene glycol butyl ether in a mass ratio of 1-3: 1.
8. The aqueous metallic coating of claim 1, wherein the co-solvent is one or both of ethylene glycol butyl ether or propylene glycol methyl ether; and/or
The wetting dispersant is a high molecular weight block copolymer solution with pigment affinity groups.
9. The aqueous metallic coating of claim 1, wherein the substrate wetting agent is a polyether modified polysiloxane wetting agent; and/or
the thickening agent is an alkali soluble swelling thickening agent.
10. The preparation method of the water-based metal coating is characterized by at least comprising the following steps:
Step a, weighing the components according to the design proportion of the water-based metal coating of any one of claims 1 to 9, uniformly stirring the weighed water-based acrylic resin, cosolvent, wetting dispersant, defoamer and pigment, and grinding until the fineness is less than or equal to 25 microns to obtain mixed slurry;
And b, adding the weighed nano titanium silicon carbide modified acrylic resin, film forming auxiliary agent, anti-flash rust agent, substrate wetting agent, rheological auxiliary agent and deionized water into the mixed slurry, stirring and mixing uniformly, adding thickening agent, and adjusting the stormer viscosity to 25 ℃ to 85-95KU to obtain the water-based metal coating.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112778853A (en) * | 2020-07-17 | 2021-05-11 | 浙江维成新材料有限公司 | Water-based nano self-drying modified metal ceramic anticorrosive coating liquid |
| CN112080175A (en) * | 2020-09-25 | 2020-12-15 | 佛山市海佳鑫五金制品有限公司 | Water-based paint replacing triacid electrochemical process effect |
| CN112375482A (en) * | 2020-11-30 | 2021-02-19 | 江苏科技大学 | Chromium-free water-based paint and preparation method and application thereof |
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| CN112680042A (en) * | 2020-12-17 | 2021-04-20 | 安徽富瑞雪化工科技股份有限公司 | Anti-aging water-based metal coating and preparation method thereof |
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